Nontoxic Bifunctional Solvent for High‐Performance Perovskite Solar Cells

  • Author: ChemistryViews.org
  • Published: 25 February 2020
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Advanced Materials/Wiley-VCH
thumbnail image: Nontoxic Bifunctional Solvent for High‐Performance Perovskite Solar Cells

Perovskite solar cells (PSCs) have excellent properties such as a high power conversion efficiency (PCE), low cost, and broad bandgap tunability. Fabricating high‐quality perovskite films is essential for the overall photovoltaic performance of PSCs. The so-called antisolvent approach is a mainstream method for preparing high‐quality perovskite films through tuning the nucleation and crystal growth. However, commonly used antisolvents such as chlorobenzene (CB) and toluene (TL) are toxic. Greener antisolvents with low toxicity, such as ethyl acetate (EA), have been used to solve this problem, but the low boiling point limits the performance of EA.


Tianshi Qin, Nanjing Tech University, China, Wei Huang, Northwestern Polytechnical University, Xi'an, China, and colleagues have used methyl benzoate (MB) as a green, non-halogenated, nontoxic, bifunctional (anti)solvent with a high boiling point for the preparation of high‐quality perovskite layers. The methyl benzoate is used as an antisolvent to rapidly generate crystal seeds in a perovskite spin‐coating step (pictured below on blue). It also acts as a digestive‐ripening solvent for the perovskite precursors during the thermal‐annealing stage (pictured below on red). There, it redissolves perovskite precursors and helps to recrystallize small crystals into larger crystallites. The MB prevents the loss of organic components (e.g., methylammonium iodide or MAI) and suppresses the formation of residual lead halide phases.


The team used this process to make perovskite layers for PSCs (architecture pictured above). The resulting devices achieved power conversion efficiencies up to 22.37 % with >1300 h stability. According to the researchers, using MB as a bifunctional (anti)solvent could significantly improve the reproducibility and stability in PSC fabrication.

 


 

 

Article Views: 764

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


Magazine of Chemistry Europe (16 European Chemical Societies)published by Wiley-VCH